Re: [PATCH 0/5] Suggested for PU: revision caching system to significantly speed up packing/walking

I don't know about the size of the rev cache on disk yet (I asked Nick
about that) nor do I really know how this cache is implemented.

The cache file for all of the linux repository (as of a few weeks ago)
is around 42MB, without names.  The names would probably add 2 or 3 MB
on top of that.  That's probably about as big as I'd want to get, as
the whole slice (minus the name list) is mapped to memory (then again
bigger might be ok; I'm not an expert on mem mapping).  The rev-cache
command fuse provides functionality to ignore certain cache sizes,
which was geared towards preventing overly large slices.